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High-strength antifatigue steel products and method for manufacturing same

A manufacturing method and fatigue-resistant technology, applied in temperature control and other directions, can solve the problems of high total amount, inability to meet, rising cost, etc., and achieve the effect of reducing alloy cost, improving toughness and fatigue resistance, and good fatigue resistance.

Inactive Publication Date: 2008-03-12
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention uses the addition of multi-element micro-alloy Nb-V-Ti, the total amount is high, and the cost rises, which still cannot meet the market demand for high-strength fatigue-resistant special steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the chemical composition of steel is as follows by weight percentage, %:

[0031] C Si Mn P S Nb Ti Alt

[0032] 0.09 0.22 1.07 0.0010 0.009 0.019 0.020 0.028,

[0033] The rest is Fe and residual trace impurities;

[0034] A method for manufacturing high-strength fatigue-resistant steel, the steps are as follows:

[0035] (1) Hot metal pretreatment

[0036] Desulfurization of molten iron is carried out by spraying magnesium particles in the molten iron tank, the weight percentage of sulfur content in the molten iron is controlled at 0.006%, the temperature is not lower than 1250°C, and the slag on the surface of the molten iron is removed after desulfurization;

[0037] (2) Converter smelting

[0038] The above-mentioned molten iron after desulphurization and slag removal is smelted in the converter, and the slagging material is added 3 minutes before the end point, and the weight percentage content of carbon and sulfur at the end point is controlled ...

Embodiment 2

[0048] Embodiment 2: the chemical composition of steel is as follows by weight percentage, %:

[0049] C Si Mn P S Nb Ti Alt

[0050] 0.08 0.24 1.10 0.011 0.006 0.020 0.023 0.043,

[0051] The rest is Fe and unavoidable impurities;

[0052] The manufacturing method is the same as in Example 1, the difference is that the billet specification: 160mm×1150, the temperature of the last pass of rough rolling: 1080°C; Temperature: 650°C, intermediate billet thickness: 30mm, finished product thickness: 5.0mm.

[0053] The relevant performance data of this high-strength fatigue-resistant steel are listed in Table 1.

Embodiment 3

[0054] Embodiment 3: the chemical composition of steel is as follows by weight percentage, %:

[0055] C Si Mn P S Nb Ti Alt

[0056] 0.08 0.26 1.08 0.010 0.007 0.018 0.022 0.022,

[0057] The rest are Fe and unavoidable impurities; the manufacturing method is the same as in Example 1. The difference is that the billet specification: 160mm×1150, the temperature of the final pass of rough rolling: 1060°C; Thickness: 30mm, finished product thickness: 5.0mm.

[0058] Table 1 Performance measurement data of steel

[0059]

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PUM

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Abstract

The invention provides a high-strength anti-fatigue steel and a manufacturing method for the steel, and pertains to the field of special steel and smelting of special steel. The method comprises adding proper amount Nb and Ti to carry out micro alloying, smelting by a combined blowing converter, LF refining, continuous casting the sheet blank, heating, removing scale by high-pressure water, hot rolling and laminar flow cooling, coiling, etc. and produces the high-strength anti-fatigue steel comprising by weight C% 0.07-0.13, Si% 0.15-0.35, Mn %1.0-1.3, P %<=0.025, S%<=0.010, Nb%0.015-0.020, Ti%0.010-0.025, Alt% 0.015-0.050, and the remainder Fe and trace foreign matters. The fatigue limit of the steel is up to 510 MPa, is of high strength, toughness and excellent forming performance, is applicable for manufacturing the longitudinal and cross beams in frames of load-carrying vehicles such as heavy and light duty trucks, etc.

Description

technical field [0001] The invention relates to a steel, in particular to a high-strength fatigue-resistant steel used for manufacturing structural parts such as frame longitudinal beams and beams of heavy trucks and light trucks, and a manufacturing method thereof, belonging to the technical field of special steel and its smelting. Background technique [0002] As an important load-bearing part of a car, the service life of the car frame will directly determine the service life of the whole car. The use conditions of automobile frame steel determine that the steel must have certain strength and toughness, good cold bending performance, and fatigue resistance, especially fatigue resistance is one of the important performance indicators of this type of steel. At the same time, this kind of steel should also have good low-temperature impact toughness. In addition, there are high requirements for plate shape and dimensional accuracy. [0003] At present, Baosteel, Wuhan Iron a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/00C22C33/04B22D11/16B21B37/74B21C47/02C21C7/064C21C7/06
Inventor 周平汤化胜陈爱娇王腾飞刘军王学新张明金王建景赵培林杨旭
Owner LAIWU IRON & STEEL GRP
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